crc32.cc File Reference

Implementation of CRC32 using precomputed remainders. More...

#include <jabberdlib.h>

Defines
#define	CRC32_UPDATE(crc, nxt)   (crc = CRC32_TAB[(crc^(nxt))&0xff]^(crc >> 8))
Functions
void	crc32_r (const char *str, char crc32buf[9])

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Detailed Description

Implementation of CRC32 using precomputed remainders.

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Define Documentation

#define CRC32_UPDATE	(		crc,
			nxt
	)		(crc = CRC32_TAB[(crc^(nxt))&0xff]^(crc >> 8))

Referenced by crc32_r().

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Function Documentation

void crc32_r	(	const char *	str,
		char	crc32buf[9]
	)

calculate a 32 bit CRC value with the polynom c(x) = 1+x+x^2+x^4+x^5+x^7+x^8+x^10+x^11+x^12+x^16+x^22+x^23+x^26+x^32 on a given string. We are initializing with zero and we are not inverting the result

Parameters:

str	the string for which we calculate the CRC
crc32buf	where to put the result

References CRC32_UPDATE.

Referenced by _xdb_get_hashes().